OKI thanks! It definitely is not the batteries, because I connected it
to a 8A powersupply to test it. So i have to search on the pcbs further
on =-(

Björn Stenberg schrieb:
> Markus Grebenstein wrote:
>
>>As I already mentioned a couple of times, the harddisk (original
>>Hitachi) of my JBS 20 doesn't spinup without external powersupply
>>(directly connected to ATA 44 pin!). If I disonnect the external DC
>>after spinup the unit works fine!
>>
>>I'm wondering if it is possible that my HD needs to much power for
>>spinup. Does anybody know how much is allowed?
>
>
> I doubt that is the problem. As some people have found out, the batteries can provide enough current to burn circuits and melt plastic.
>
> I'm guessing it's either a battery problem or a wiring/solder/board problem.
>
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